Top roll for drawing frames



May 18, 1954 L. M. co'rcHE'r-r 2,678,475

TOP ROLL FOR DRAWING FRAMES Filed lay 14. 1952 `machinery, `frames,sliverand ribbon lap machines, comber Patented May 18, 1954 UNITEDSTATES PATENT OFFICE TOP ROLL FOR DRAWING FRAMES Louis M. Cotchett,Whitman, Mass., assignor to Textile Engineering Corporation, Whitman,Mass., a corporation of Massachusetts Application May 14, 1952, 'SerialNo. 287,734

4 Claims.

. l u This invention relates to top rolls for textile more particularlyfor drawing draw boxes and the like.

` It is common practice to provide for these machines rigid one-piecetop rolls having a single long boss and journals integral with therolls, the

`or cap bars and against the weighting means and the uneven rotation andensuing bad work caused thereby, resort has been had to anti-frictionbearings of both ball and roller types applied to the journals `tosupport the saddles or hooks `and thus to handle the `substantial radialload `imposed by the weighting means. `these bearings usually areincapable of properly However,

providing for the end thrust which arises because such rolls arerelatively long and seldom quite parallel to the bottom rolls and atright angles to the travel of the sliver, which departure from parallelacts to impart an endwise or axial crawl to the rolls. Anti-frictionbearings for such rolls, therefore, must withstand both the normalradialthrust and also this axial thrust.

i There is not room available within thecap bar slots to house an`angular contact or combined radial-axial bearing of a size capable ofenduring the loads imposed on it by the weighting hook and at the sametime maintain the roll journal `of a diameter adequate to sustain this`load without intolerable distortion, For full anti-friction mounting,at least two separate bearings of angular contact type must` be suppliedat each roll journal and spaced well apart with the weighting hooklocated betweeen them in order to hold the end cap or sleeve whichhouses the bearings in coaxial relation to the journal and preventcramping ofthe bearings under the weighting load. But locating theminwardly of the cap bars shortens the working surface of the roll. l i

Therefore, the object of this invention is to provide a novel top rollof simple and compact construction which overcomes the above notedobjectionable features and which can be substituted for prior plainbearing type `rollsin existing machines without change in the cap barsor other parts.

Another object of the invention is to provide an improved top roll whichembodies few parts and yet is so constructed that it does not rotatablyengage the bearing blocks or cap bars and weighting means.

Another object of this invention is to provide `an improved toprollwhich permits the greatest possible working surface of the roll butwhich has bearings so constructed as to be free of any limits on theirability to carry the load of the weighting means imposed by the size oithe cap bar slot.

In an effort to overcome the drawbacks above I have resorted to theshell type or loose boss top rcll` construction, in which a cot-coveredroll `shell revolves upon an axle mounted in nonrotating relation in thecap bars of the frame. Satisfactory operation of shell type top rollsrequires the use of anti-friction bearings between `the shell and theaxle, but here also the heavy weighting which must be applied to theends of these single boss top rolls and the resulting flexing of theaxle cramps a ball bearing, causing rapid and destructive wear thereof,by tilting the cone out of axial alignment with the ball race.,

`The, space within the roll shell available to take the ball bearing isseverely limited by the outside diameter of the cot, which is dictatedby the `length of staple being drawn, and by the thickness of the cotwall required to give it the necessary resilience for proper drafting.Thus the ball bearing cannot be enlarged in size to in or needle typebearings, through offering increased load-bearing capacity withoutincrease in outside diameter, cannot be used here because they will notwithstand the end thrust arising as described, and are even more subjectto cramping under flexing of the axle because of their greater axialextent.

l `According to the invention, I provide a single boss shell type toproll in which angular Contact ballbearings capable ci' accepting bothradial and axial loads are employed, and increase the loadbearingcapacity without increase of the outside diameter of the top roll byproviding two such ball bearings preferably in reversed or back-to-backrelationlocated in a recess in each end oi the metal roll shell. Thenon-rotating axle is preferablystiiened against flexing by increasingthe diameter of the portion of its length lying between the pairs oibearings to substantially the tial part of its length at the end of thesleeve adjacent a bearing.

2. A weighted top roll for drawing frames having in `coirioination anon-rotating axle, a roll shell, a pair of angular contact ball bearingsdisposed in reversed relation to each other within each end of the rollshell and supporting the latter rotatably upon the axle, the axle havingabutment means within the roll shell engaging with the inner bearing ofeach pair, and end caps to be engaged 'by the Weighting means and :fixedon the axle, each end cap engaging the outer bearing of one pair.

3. A Weighted top roll for drawing frames hav- 4. A weighted top rollfor drawing frames hav- 25 ing in combination a non-rotating axle, aroll shell, a pair of angular' contact ball bearings disposed inreversed relation to each other Within each end of the roll shell andsupporting the latter rotatably upon the axle, the axle having a portionof increased diameter engaging the inner bearing of each pair, and endcaps to .be engaged by the Weighting means and fixed on the axle, eachend cap engaging the outer bearing of one pair, the portions of the endcaps adjacent such rhearings being of thin-Walled constructionthroughout the greater part of the interval from the outer bearing tothe point of engagement with the weighting means.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 352,739 Daniel Nov. 16, 1886 840,010 Ragsdale Jan. 1, 19071,484,045 Wardwell Feb. 19, 1924 2,355,511 Cobb Aug. 8, 1944 FOREIGNPATENTS Number Country Date 511,156 France Sept. 20, 1920 677,776 FranceDec. 18, 1929 528,250 Great Britain Oct. 25, 1940

